Straight Bevel Gearbox
A straight bevel gearbox transmits torque between intersecting shafts (usually 90 degrees) using bevel gears whose teeth are cut straight and radial along the pitch cone, tapering toward the cone apex. The teeth engage along their full face simultaneously, which makes the gearing simple to manufacture and inspect and well suited to lower-speed, direction-changing duty where smoothness at high rpm is not critical.
Single-stage ratios typically run from about 1:1 up to 6:1; torque capacities span a few Nm in instrument and valve-actuation drives to several thousand Nm in heavier industrial frames, with power from fractional kW upward. Single-stage efficiency is generally in the 90-97% region. Because all teeth mesh at once, straight bevel gears tend to be noisier above roughly 1,000 rpm than spiral bevel, so they are commonly applied at moderate speeds. Tooth design and rating follow ANSI/AGMA 2005 and 2003 (or ISO 23509 / ISO 10300), with enclosed-drive rating per AGMA 6010 and quality per ISO 1328 / AGMA 2015.
Gears are typically alloy or carbon steel, case-hardened where duty demands (20MnCr5 / 18CrNiMo7-6) and ground or lapped; housings are cast iron or aluminium on rolling bearings with lip or labyrinth seals. Backlash is offered in standard and reduced classes.
Configuration covers solid or hollow output shafts, foot, flange (B5/B14) and shaft-mounted arrangements, IEC/NEMA motor adapters or free input shafts, multiple mounting positions, and mineral or synthetic PAO (ISO VG 220/320) lubrication, often lifetime-filled on smaller frames. Service factor is selected per AGMA guidance for the duty.
Himalay's MSME partners manufacture straight bevel gearboxes with gear-rating to AGMA / ISO 6336, ISO 9001 quality systems, load and efficiency test reports and material traceability; CE (Machinery Directive), ATEX/IECEx for hazardous areas, and SABER (Saudi Arabia) coordinated as part of the standard order flow.
